Sigma 8- 15mm maximum aperture F4.5
Canon 10-22mm maximum aperture F3.5
Sigma 10-20 is a constant aperture lens, which usually means that the zoom lens can use its nominal maximum aperture in all focal lengths.
The first three lenses have a wider wide-angle end than Sigma 8-15 mm.
The first three are mainly suitable for shooting scenery, wide-angle lens, scenery head and wide-angle end. More powerful wide angle.
Canon 50/ 1.4 is a fixed-focus lens and portrait lens, which is mainly suitable for taking portraits. A constant large aperture of 1.4 can shoot a better background blur effect.
Canon 15-85mm zoom lens is a head display with a wide range of uses, which can be used for portraits and landscapes.
Canon 85/ 1.8 fixed-focus lens looks like a head, but the focal length is longer.